" That which is in view in this third item of our passage so far transcends the grasp of the finite mind that it is impossible to give it adequate expression in words. Christ is the irradiation of God’s glory. The Mediator’s relation to the Godhead is like that of the rays to the sun itself. We may conceive of the sun in the firmament, yet shining not: were there no rays, we should not see the sun. So, apart from Christ, the brightness of God’s “glory” could not be perceived by us. Without Christ, man is in the dark, utterly in the dark concerning God. It is in Christ that God is revealed. "

― Arthur W. Pink , An Exposition of Hebrews (Arthur Pink Collection)